Motion tracking a shot where no tracking point is in frame throughout the video
There is no problem in this situation.  All you need to do:


is in solve settings set keyframe A and keyframe B where you have enough motion and more then 8 point are the same.  So it can be not the start and end frame.
And also you need to track points from start and end (and maybe in middle) - your goal is to make shure that every frame have 8 or more enabled tracking points. They may be different, but due to the fact that new markers pick up motion, tracking will continue